Besides liability do other caterers carry a seperate policy on your trailers or cookers that tow behind?
If you don't you should seriously consider doing so, we have coverage on ours similar to what you would carry on your tow vehicle.
In CT we have to register any trailer with motor vehicle which then prevents it from being covered under a homeowners policy for any damage or theft.
I have a buddy who lost a 10K southern pride due to theft, it was trailer mounted without insurance. If your trailer gets hit by another vehicle and totaled and its not insured you might be eating the replacement cost!
Worth looking into!